. Linear Programming Problem, Operation Management

A paper mill produces two grades of paper viz., X & Y. Because of raw material restrictions, it cannot produce more 400 tons of grade X paper & 300 tons of grade Y paper in a week. There are 160 production hours in a week. It requires 0.20 & 0.40 hours to produce a ton of grade X & Y papers. The mill earns a profit of Rs.200 & Rs.500 per ton of grade X & Y paper respectively. Formulate this as a Linear Programming Problem.